Tools for Slovak entrepreneurs.
A set of calculators and generators we use internally while building 1FAKTURA, opened up to the entire Slovak business community. No login, no tracking beyond analytics. Selected tools can be embedded on your own site via iframe.
VAT calculator
Slovak VAT calculation (23 %, 19 %, 5 %, 0 %) from net or gross amounts. Embeddable on your site.
Open tool →IBAN from account number
Converts the legacy Slovak account number format (prefix, number, bank code) into international IBAN.
Open tool →IBAN validator
IBAN check per ISO 13616. Works for every European country.
Open tool →QR PAY generator
Generates a Pay by Square QR code for Slovak banks — IBAN, amount, variable symbol.
Open tool →Invoice generator
Fast PDF + UBL 2.1 XML generator for Slovak invoices, no signup. QR PAY, Slovak VAT rates, full diacritics.
Open tool →E-invoice penalty calculator
Reference page on the penalty framework for electronic invoicing — § 154/§ 155 of the Slovak tax code, €100 – €10,000.
Open tool →Reverse charge
Reverse-charge checker per § 69(12) of the Slovak VAT Act. Construction work, scrap metal, mobile electronics, EU supplies.
Open tool →UBL validator
Validate a UBL 2.1 XML invoice against EN 16931 + Peppol BIS Billing 3.0. ~25 checks, data stays in your browser.
Open tool →Peppol lookup
Check whether a Slovak company has a Peppol Participant ID and which document types it accepts. Input VAT ID → output 9950:SK… + BIS Billing 3.0 support.
Open tool →VAT control statement analyzer
Validate the XML VAT control statement before filing — sections A1 to D2, base and VAT totals, duplicate invoices, VAT ID format. Data stays in your browser.
Open tool →Issue your first
e-invoice today.
14 days full Pro with a card on file (cancel any time before the trial ends). Or Štart €0 forever, no card. We'll do the migration and setup for you — free, within 24 hours.
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